Figure 5

δ¹⁸O_SC (solid) and Suess-adjusted δ¹³C_SC (open) of individual annual dentine growth layer groups (GLGs) of teeth from killer whales that stranded in the eastern Canadian Arctic (ECA; turquoise circles) and the Northwest Atlantic (NWA; purple squares). Values are standardized to that of the first GLG. Higher within-tooth δ¹⁸O_SC variation indicates greater interannual variability in distribution. Although dietary influences on δ¹³C_SC cannot be constrained, concurrent (often inverse) variation in δ¹³C_SC with δ¹⁸O_SC in most of the profiles is consistent with patterns exhibited in the North Atlantic δ¹⁸O and δ¹³C isoscapes¹⁹. Note different axes of two lower left panels.